The Fathoms Below

● "Now, thanks to radical advances in genetics and medicine, humanity has found a way to return to its origins. Beneath the waves, a new civilization is rising—one built on the dream of reclaiming the oceans and transforming the deep sea into humanity's next frontier. 19-year-old Dallas Dwight is one among many to become new merfolk. And while she is getting used to her new body, she has to get used to a new environment that is still new to civilization. Her singing talent on land adapted into something else under the sea: Echolocation, and this proves to be more useful than she ever imagined. But there are some things that did not go extinct. Her new home is threatened by an unknown monster, something from the deep that has discovered this new and plentiful food source." ― paraphrased/edited from this book's product page on Amazon.com as 2026-06-09.